Input-output format control (RDF/XML)

--rdf
--rdf=<flags>

where input flags are from

S - Strict spec. Unknown parse type treated as Literal instead of error.
T - take foreign XML as transparent and parse any RDF in it
(default it is to ignore unless rdf:RDF at top level)
L - If non-rdf attributes have no namespace prefix, assume in local <#> namespace
D - Assume default namespace decalred as local document is assume xmlns=""

and output flags are from

c - Don't use elements as class names
d - Don't use default namespace

Only one of --rdf and --n3 is active at any place on the command line and
applies to either input or output, whatever happens.